Lighting fixtures

ABSTRACT

A lighting fixture employs a pair of reflectors related to a lamp housing which includes socket means for a lamp. One reflector is substantially tubular and extends into the housing to surround a portion of a lamp. The second reflector having a diameter larger than the diameter of the first reflector is positioned above in spaced relationship with respect to the first reflector. An enclosure of light transmitting material extends between the spaced reflectors and has a diameter which is not less than the diameter of the second reflector. The second reflector is formed to distribute light directed thereto from a lamp and from the first reflector through the enclosure. By selecting tubular reflectors having differently angled inner reflecting surfaces, different illumination patterns are obtained without changing the outer dimensions of the tubular reflector or of the fixture.

[ 51 Mar. 21, 1972 United States Patent Lasker Primary Examiner-CharlesA. Ruehl Attorney-Harry G. Shapiro 1541 LIGHTING FIXTURES [72] Inventor:

Martin Lawrence Lasker, Metuchen, NJ.

Moldcast Manufacturing Company, ABSTRACT A lighting fixture employs apair of reflectors related to a lamp [731 Assignee:

Newark, NJ.

June 1, 1970 [22] Filed; housing which includes socket means for a lamp.One reflector is substantially tubular and extends into the housing tosur- 1 App]. No.:

round a portion of a lamp. The second reflector having a diameter largerthan the diameter of the first reflector is positioned above in spacedrelationship with respect to the first reflector. An enclosure of lighttransmitting material extends between the spaced reflectors and has adiameter which is not less than the diameter of the second reflector.The second reflector is formed to distribute light directed thereto froma lamp and from the first reflector through the enclosure.

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INVENTOR. MAR'HN LAWRENCE LASKER ATTQRN EV BACKGROUND OF THE INVENTIONThe glare zone of a lighting fixture is the wide angle most common toviewers approaching the fixture. The illumination zone is the area ofdesired illumination and may be varied in accordance with the shape ofthe area to be illuminated. In a lighting fixture for indoor or outdooruse, it is desirable to obtain light distribution over a relatively wideillumination zone while retaining an extremely low glare appearance.Such characteristics are of particular concern in outdoor lightingarrangements where it is desired that the fixture illuminate arelatively wide area together with the elimination of glare. Glarecauses interference with normal viewing and, in general, detracts fromthe overall appearance of both the fixture and of the area illuminated.

It also is desirable that a lighting fixture permit simple modificationof its structure to enable changing or altering the distribution oflight emitted thereby. There are various prior art devices which containmovable parts in order to direct or redirect light to cover selectedareas. Such prior art devices include swivel type bases and othermechanically movable means which are subject to wear and generallyrequire maintenance.

Other prior art lighting fixtures of the hidden light source type areprovided with various reflector arrangements whereby the light isemitted to a constant predetermined area. While such devices eliminatethe mechanical means for altering the light pattern, any change ormodification which will furnish an enlarged area of illumination ordifierent light pattern is accompanied by the requirement to change thesize of the fixture and the associated reflectors. As a result, themanufacturer or supplier must include a relatively large inventory ofvarious size fixtures to accommodate different lighting requirements.

SUMMARY OF THE INVENTION In accordance with the invention, a lightingfixture is provided which comprises a lamp housing including socketmeans for a lamp. A first substantially tubular reflector extends intothe housing and is adapted to surround a portion of a lamp. A secondreflector having a diameter larger than the diameter of the firstreflector is positioned above and spaced from the first reflector. Anenclosure of light transmitting material which has a diameter not lessthan the diameter of the second reflector extends between and isconnected to the reflectors. The second reflector lies in a planesubstantially transverse of the central longitudinal axis through thefixture; that is, the axis which extends through the socket means, thefirst reflector and the center of the second reflector. The secondreflector acts to distribute light directed thereto from a lamp and fromthe first reflector, the light being emitted through the lighttransmitting enclosure.

Without changing the outer parameters of the reflector or lightingfixture, different and enlarged illumination zones are obtained bysimply changing the angle of the reflecting surface provided by thefirst or substantially tubular reflector which acts as a collectingreflector and directs light to the constant second or distributingreflector.

In the preferred form of the invention, the two reflectors and theenclosure of light transmitting material are in the form of a unitaryassembly. The enclosure itself acts as the means for maintaining thereflectors is predetermined spaced relationship. The unitary assemblyaspect of these essential parts enables the disconnection of theassembly from a lamp housing for relamping when necessary, whilemaintaining the predetermined fixed spatial relationship of the parts ofthe assembly and the proper alignment of the parts with the lightsource.

These, and other advantages and improved results of the invention willbe apparent from the following description of a preferred embodiment ofthe invention, taken in conjunction with the drawings which are on areduced scale.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of alighting fixture made in accordance with the invention, the fixturebeing shown atop a pole which is partially illustrated;

FIG. 2 is a vertical, cross sectional view of a lighting fixture shownin FIG. 1, this view also showing various line representations of thepatterns of the light rays:

FIG. 3 is a view taken approximately in the plane of line 3 3 of FIG. 2;

FIG. 4 is a view taken approximately in the plane of line 4- 4 of FIG.2;

FIG. 5 is a horizontal, cross sectional view taken approximately in theplane of line 55 and in the indicated directions of FIG. 2;

FIG. 6 is a vertical cross sectional view similar to FIG. 2, thispartial view including a collecting reflector having a differentlyangled reflecting surface than the collecting reflector shown in FIG. 2;

FIG. 7 is a view similar to FIG. 2 except that the assembly of thereflectors and the light transmitting enclosure is shown retracted fromthe lamp housing about a hinge;

FIG. 8 is a partial perspective view of a pair of lighting fixtureshaving an annular configuration rather than a square contour as shown inFIG. 1, the fixtures being mounted atop a pole partially shown; and

FIGS. 9, 10, 11 and 12 are schematic views illustrating a plurality ofillumination patterns which may be provided by a lighting fixture madein accordance with the invention.

DESCRIPTION OF THE PREFERRED EMBODIMENT Referring to the drawings, andas best shown in FIG. 2, a lighting fixture F made in accordance withthe invention comprises a lamp housing A which includes socket means 20adapted to receive a lamp L. A substantially tubular reflector B extendsinto the housing and is adapted to surround the upper portion of thelamp. A second reflector C having a diameter larger than the diameter ofthe reflector B is positioned above and spaced therefrom. An enclosure Dmade of a light transmitting material extends between and is connectedto the reflectors B and C. The enclosure has an overall diameter notless than the diameter of the reflector C. The reflector C lies in aplane substantially transverse of the central longitudinal axis 0 (alsothe optical axis) of the fixture, or the axis which extends centrallythrough the socket means 20 and the centers of the reflectors B and C.The distributing reflector C distributes light directed thereto from alamp and from the collecting reflector B, the light being emittedthrough the enclosure D.

The described lighting fixture is particularly suitable for outdoorlighting. As shown in FIG. 1, the fixture F is mounted atop a hollowpole P within which suitable power lines (not shown) are extended to thesocket 20. As is known in the art, a ballast 22 may be positioned withinthe pole to energize alight source, for example, a mercury vapor lamp.Any suitable light source may be fitted into the socket including anincandescent lamp.

In greater detail, the lamp housing A preferably is made by die castinga suitable alloy such as aluminum or zinc, and is opaque. The housingwhich is hollow and generally frustoconiea] in its interior with thelarger diameter at the top is formed at its lower end with an opening toreceive the top end of the pole P. A sealing gasket 24 is providedbetween the wall of the pole and the periphery of the opening. Thesocket 20 preferably is resiliently mounted and together with resilientmeans for engaging the sides of a lamp, furnishes a universal floatingmounting for the lamp which assures that the optical axis of the lamp iscentered on the axis a, and further accommodates lamps of varying lengthwherein the bulb may also be slightly eccentric with respect to itsbase.

As shown in FIG. 2, the socket 20 is held in the housing by a bracket26, the bracket being provided with radially extending flanges 28through which screws 30 are extended with the ends of their shanksbearing against a wall provided by the housing. The shanks of the screwsintermediate the bracket flanges and the heads of the screws accommodatehelically coiled compression springs 32. As shown in FIGS. 2 and 5, aplurality of circumferentially arranged shoulders 34 are provided tofurnish supports for the connection thereto of respec tive leaf springmembers 36 adapted to engage and centralize a lamp L when positionedwithin the resiliently mounted socket 20. The described arrangementassures that the grid or filament 38 of the lamp is located on thecentral axis 0.

As also shown in FIG. 2, an annular lower support member 40 having acentral opening substantially equal to the opening of the lamp housingat its top side is positioned to rest upon the upper edge of thehousing. For convenience in manufacture, the member 40 preferably ismade as a separate piece by die casting. Actually, the member 40functions as a part of the lamp housing. As best shown in FIGS. 2 and 7,the member 40 is connected to the housing A by a plurality ofcircumferentially arranged screws 42 which extend through the member andinto tapped holes formed in the lamp housing. As shown in FIGS. 2 and 5,an upper support member 44 substantially identical with the member 40rests thereon and is releasably connected thereto and to the lamphousing by a plurality of spaced, circumferentially arranged screws 46extended through the housing, through the lower support member 40 andinto tapped holes formed in the upper support member 44.

The support member 44 serves as a mounting for the collecting reflectorB. As shown in FIG. 2, this reflector is substantially tubular and ofinverted frustoconical form, it being flared outwardly at the top. Thereflector is provided with an annular peripheral flange 48 permittingconnection to the support member 44 by a pair of clips 50. As shown inFIG. 4, the clips are located to engage the flange 48 on opposite sidesof the reflector. The clips are secured by screws 52 extended throughthe ends of the clips with the shanks of the screws in tapped holesformed in the upper support member 44. The reflector B preferably ismade of aluminum and is provided with an inner reflecting surface 54.Any suitable reflecting surface may be provided, for example, a specularanodized finish with a minimum 80 percent reflectance. The reflectingsurface 54 as presented toward the central axis of the fixture isconvex.

The distributing reflector C is maintained in predetermined spacedrelationship above the reflector B by the intermediate connectingenclosure D. The enclosure is made of a light transmitting material,preferably a transparent material such as a clear acrylic resin or glasswhich may be tinted. Although not as desirable, a translucent materialmay be used. The enclosure has a wall sufiiciently thick to serve as astructural material whereby the reflectors are maintained inpredetermined spaced relationship by the enclosure. As will be evidentfrom FIG. 2, the reflector C has a diameter substantially greater thanthe diameter of the reflector B, and the light transmitting enclosure Dhas a diameter which is at least as great, and preferably greater thanthe diameter of the reflector C. For example, and not by way oflimitation, the reflector C may have a diameter of approximately 23inches; the reflector B a diameter of approximately 7.5 inches at thetop where it has its largest diameter (exclusive of the connectingflange); and the light transmitting enclosure D may have a diameter of26.5 inches. It will be understood that the term diameter" is used inthe general sense to include the transverse dimension of a square partsince the enclosure, for example, may have a square FIG. 1 rather than acircular (FIG. 8) contour.

As will be subsequently described, the support member 44, the collectingreflector B, the distributing reflector C, and the light transmittingenclosure D preferably constitute a unitary assembly As shown in FIGS. 2and 3, the reflector C, which preferably is made of aluminum, iscircular and has an inner reflecting surface 55. Any suitable polishedreflecting surface may be provided, for example, a specular anodizedfinish with a minimum percent reflectance. The reflecting surface 55faces the reflector B and a lamp L when inserted in the socket 20. Asshown in FIG. 2, the reflector C lies in a plane substantiallytransverse of the central longitudinal axis 0, and in the preferredembodiment of the invention as shown, the reflector is contoured toprovide an annular, rather shallow concave surface intermediate thecenter and the outer periphery of the reflector.

As shown in FIGS. 2 and 7, the enclosure D is formed with a centralopening 56 on its bottom side 58. As shown in FIG. 5, the upper supportmember 44 is provided with spaced, tapped holes 60 to receive screws(not shown) which are extended through the bottom wall of the enclosurejust outwardly of the opening 56 to thereby secure the enclosure to thesupport member. A sealing gasket 57 is positioned in a groove formed onthe top side of the member 40 for engagement with the enclosure wall 58,and a second sealing gasket 59 is positioned in a groove formed on theunderside of the support member 44 for engagement with the opposite sideof the enclosure wall As shown in FIGS. 2 and 3, the enclosure D issecured to the distributing reflector C by a dome-like connecting member62, preferably made of aluminum, and by a supporting bracket 64. Thebracket is connected at the top to the dome member 62 by threading nutsonto connecting studs 66 after the flanges 68 of the bracket arepositioned on the studs. The lower end of the bracket is provided with atapped hole through which a screw 68 is extended, the head of the screwbeing positioned on the inner side of the reflector at its center. Thetop side 70 of the enclosure D is provided with a large central opening72 to allow the inturned edge 74 of the reflector C to extendtherethrough with a close fit. The dome member 62 has a downturnedflange 76 to engage the wall 70 of the enclosure. A gasket 78 ispositioned between the parts to provide a seal. The unitary assembly ofthe two reflectors and the light transmitting enclosure is completed bysecuring the dome member to the enclosure in any suitable manner. Asshown in FIG. 3, a plurality of connector clamps 80 may be utilized forthis purpose. The come member may be provided with tapped holes and theclamp members may be held by screws extended into the tapped holes.

To enable ready access to the inside of the lamp housing A for lampingand relamping, hinge means is provided to allow the unitary assembly ofreflector B, reflector C and light transmitting enclosure D to berotated or tilted away from the lamp housing A from the position asshown in FIG. 2 to the position shown in FIG. 7. As shown in FIGS. 2, 5and 7, a pair of spaced bottom hinge members 82 are secured to thesupport member 40. The hinge members are in the form of bent wires whichare secured in place by screws 84 threaded into tapped holes formed inthe support member 40. The upper support member 44 is provided with apair of aligned, spaced hinge members 86 cooperable with or hooked aboutthe hinge members 82. The hinge members 86 are similarly secured to theupper support member 44.

The assembly of reflectors and light transmitting enclosure movable as aunit about the hinge members assures the concentricity of the reflectorswith respect to a lamp mounted within the housing at all times. It willbe apparent that to tilt the assembly from the position shown in FIG. 2to the position shown in FIG. 7, the screws 46 are first removed todisconnect the assembly from the lamp housing, and after tilting andlamping or relamping, the screws are rethreaded into the parts to securetheir connection.

With a collecting reflector B having a reflecting surface 54 of acurvature as shown in FIG. 2, the light rays have the paths indicated bythe lines a, b and 0. Light is shown coming mainly from the lightproducing element 38 of the lamp, such light rays being indicated by thesolid lines a. This is not strictly accurate since much of the lightbounces off the reflecting inner surface of the lamp, where the lamp isof the reflector type. However, for the purpose of representing the raysof light or light paths, this manner of illustration is the most simpleand is generally indicative of the manner of operation. In any event,the rays of light which are directed to the reflecting surface 55 of thedistributing reflector C without striking the collecting reflector B toany appreciable extent are indicated by the solid lines a. The rays oflight which strike the upperportion of the collecting reflector B areshown by the dash-dash lines b, and the light rays which strike thelower portion of the collecting reflector and directed to thedistributing reflector are indicated by the dot-dash lines c. The directrays a may be divided basically into two types. Those striking thenarrow outer return edge of the distributing reflector C are directedgenerally downward to light up the area directly below the device. Therays striking the greater center portion of the distributing reflector Care directed out at wider angles ofi' the vertical up to a maximum ofapproximately 60 off vertical. Several of the light rays which leave thedistributing reflector at the maximum of 60 are illustrated to show thebroad surface area of the reflector which is directing light out, andwill therefore appear bright when viewed at a 60 angle off vertical (seethe lines a following the reflector contour).

The light rays b reflected off the upper portion of the collectingreflector B are directed outwardly by the distributing reflector C atangles which generally are between those of the downward component raysb and the maximum 60 components of such light rays. The light rays bfunction as fill and support the light between the maximum and minimumangles of these components.

The light rays 0 leaving the lamp L at an angle of 40 to 50 arereflected off the lower portion of the adjoining collecting reflector B,cross over to the opposite side of the center line 0 and are directedout through the light transmitting enclosure D by the distributingreflector C at a high angle, or an angle up to approximately 70 offvertical. Some of the light rays which leave the distributing reflectorat 70, as illustrated, show the broad surface area of the distributingreflector which is reflecting light out, and therefore a brightappearance is furnished when viewed at a 70 angle off the vertical.

The above described light distribution is accomplished with the lampcompletely hidden from view, the lamp being surrounded by the opaquehousing. No light leaves the fixture at angles higher than approximately72 vertical. The light leaving the distributing reflector C at near 70has emanated from the lamp at approximately 45". With the lightdistribution afforded by a mercury vapor lamp having a given candlepower at 45 from the beam axis which is close to maximum, the lightingfixture of the invention distributes a substantial amount of light below70 and hardly any light above 72". This sharp break in lightdistribution is highly desirable; light is spread over a wide area whilecomplete glare cutoff is obtained at a viewing angle which is as high aspossible off the horizontal plane. Also, when the viewer looks at thefixture at angles just within the illumination zone, the brightness onthe distributing reflector C is spread over a broad area furnished byits surface. It is therefore less disturbing to the viewer than would bethe same amount of light coming from a small source.

When the amount of light is traced which is reflected at various anglesfrom the fixture, it is found that the emitted candle power is lowestnear the vertical central axis 0 of the fixture, and increases in arelatively smooth curve out to 60 and then decreases somewhat to 70 atwhich point the illumination is substantially cut off. Thus, afoot-candle distribution on the horizontal plane which is relativelyeven from the central vertical axis of the device out beyond 60 issoftened at about 70 to eliminate a sharp delineation at the edges ofthese zones. As a result, the fixture of the invention produces an evendistribution of light over a wide area while affording extremely lowglare.

With a collecting reflector B having the contour shown in FIG. 2, alight distribution pattern is obtained as schematically shown in FIG. 9.Such distribution pattern may be termed a wide angle pattern asfurnished by a reflector having its reflecting surface 54 at arelatively narrow angle, the angle x as shown in FIG. 6, with respect tothe central axis 0 of the fixture.

The light distribution pattern may be readily changed without changingthe dimensions of the fixture by simply substituting a differentlyangled collecting reflector. The outer diameter of the reflector also isnot increased. As shown in FIG. 6, segments of a reflector B may beadhered by a suitable cement to the underlying reflector B having thedescribed contour of reflecting surface 54. The reflecting surface ofthe reflector segment or segments B is designated 54', and furnishes anarrow angle light distribution pattern. As compared to reflector B, areflector B, or segments B, have a reflecting surface 54 which is at anincreased angle, the angle x (FIG. 6), with respect to the longitudinalcenter line a of the fixture.

In terms of light distribution pattern, it will be apparent that theentire wide angle collecting reflector B may be replaced by an entirenarrow angle reflector B, whereupon, an illumination pattern, asschematically shown in FIG. 10, will be obtained. With the narrow anglecollecting reflector B, the rays of light are as indicated in FIG. 6.Essentially, the light rays are prevented from crossing over from oneside of the reflector to the opposite side, and in this way, the highangle of light distribution is eliminated. With a narrow anglecollecting reflector, the maximum angle of light emitted through thelight transmitting enclosure D is at an angle of approximately 60 causedby the light which goes directly to the distributing reflector. Whereas,with a wide angle collecting reflector as shown in FIG. 2, light emittedat the 60 angle is spread over a wide surface of the distributingreflector C, with a narrow angle reflector, the distribution of light isconfined to a reduced surface of the distributing reflector. As in thecase of wide angle distribution on the order of 70, a viewer,nevertheless, looking at the fixture within the illumination zone wouldbe less disturbed by the large area of brightness than he would be by asmaller area having the same total brightness.

Where a plurality of narrow angle reflector segments B are associatedwith a wide angle reflector B therebeneath, illumination patterns suchas schematically shown in FIGS. 11 and 12 may be obtained. It will beapparent that different illumination patterns may be obtained bychanging the positions of the narrow angle reflector segments withrespect to the underlying wide angle reflector.

Where, as shown in FIG. 1, the enclosure has a rectangular or squareconfiguration, the outside contour of the lamp housing A may be madewith flat planar surfaces to carry out the esthetic theme of suchconfiguration; also, the dome member 62 which supports the distributingreflector C may also be made of a square outline. Where, as shown inFIG. 8, the light transmitting enclosure, designated D, is made round orcircular, the esthetic theme of circularity may be kept by making theouter contour of the lamp housing A of such contour, also the contour ofthe dome member 62.

It will be apparent that a lighting fixture having a circular lighttransmitting enclosure may be mounted on a single pole in lieu of thesquare enclosure as shown in FIG. 1. A plurality of lighting fixtureshaving circular light transmitting enclosures may be mounted on hollowcrossbars extending from a pole P as shown in FIG. 8. Two or fourlighting fixtures may be so mounted; also different configurations oflight transmitting enclosures may be used rather than the illustratedsquare and round.

The advantages and improved results of the invention will be apparentfrom the foregoing description of a preferred embodiment of theinvention. Various changes and configurations may be made withoutdeparting from the spirit and scope of the invention as sought to bedefined in the following claims.

I claim:

l. A lighting fixture comprising a lamp housing including socket meansfor a lamp, a first substantially tubular reflector adapted to surrounda portion of a lamp, a second reflector having a diameter larger thanthe diameter of the first reflector spaced from and positioned above thefirst reflector, and an enclosure of light transmitting material havinga diameter not less than the diameter of the second reflector extendingbetween and connected to the reflectors, the enclosure having a centralopening on its underside, an annular support member secured to theenclosure extending through-the opening, said first reflector beingmounted on the support member to extend therethrough and into the lamphousing, the second reflector lying in a plane substantially transverseof a central longitudinal axis extending through the socket means, thefirst reflector and the second reflector, and means separably connectingthe support member to the lamp housing.

2. A lighting fixture according to claim 1, wherein the first reflectoris substantially frustoconical and has its largest internal diameter atthe end thereof facing the second reflector.

3. A lighting fixture according to claim 2, wherein the inner reflectingsurface of the first reflector is at a relatively wide angle withrespect to the central longitudinal axis.

4. A lighting fixture according to claim 2, wherein the inner reflectingsurface of the first reflector is at a relatively narrow angle withrespect to the central longitudinal axis.

5. A lighting fixture according to claim 2, wherein the inner reflectingsurface of the first reflector has a segment thereof at a relativelywide angle and a segment at a relatively narrow angle with respect tothe central longitudinal axis.

6. A lighting fixture according to claim 1, wherein the second reflectoris circular and has an annular concave por tion intermediate its centerand its outer periphery.

7. A lighting fixture according to claim 1, including means for hingingthe support member to the lamp housing.

8. A lighting fixture according to claim 1, wherein the enclosure has acentral opening on its upperside, the second reflector being positionedin said opening, and means to secure said reflector to the adjoiningwall of the enclosure.

9. A lighting fixture according to claim 1 wherein the socket means ismounted on a bracket having radially extending flanges, resiliencymounted screw means extended through the flanges and cooperable with awall of the housing.

1. A lighting fixture comprising a lamp housing including socket meansfor a lamp, a first substantially tubular reflector adapted to surrounda portion of a lamp, a second reflector having a diameter larger thanthe diameter of the first reflector spaced from and positioned above thefirst reflector, and an enclosure of light transmitting material havinga diameter not less than the diameter of the second reflector extendingbetween and connected to the reflectors, the enclosure having a centralopening on its underside, an annular support member secured to theenclosure extending through the opening, said first reflector beingmounted on the support member to extend therethrough and into the lamphousing, the second reflector lying in a plane substantially transverseof a central longitudinal axis extending through the socket means, thefirst reflector and the second reflector, and means separably cOnnectingthe support member to the lamp housing.
 2. A lighting fixture accordingto claim 1, wherein the first reflector is substantially frustoconicaland has its largest internal diameter at the end thereof facing thesecond reflector.
 3. A lighting fixture according to claim 2, whereinthe inner reflecting surface of the first reflector is at a relativelywide angle with respect to the central longitudinal axis.
 4. A lightingfixture according to claim 2, wherein the inner reflecting surface ofthe first reflector is at a relatively narrow angle with respect to thecentral longitudinal axis.
 5. A lighting fixture according to claim 2,wherein the inner reflecting surface of the first reflector has asegment thereof at a relatively wide angle and a segment at a relativelynarrow angle with respect to the central longitudinal axis.
 6. Alighting fixture according to claim 1, wherein the second reflector iscircular and has an annular concave portion intermediate its center andits outer periphery.
 7. A lighting fixture according to claim 1,including means for hinging the support member to the lamp housing.
 8. Alighting fixture according to claim 1, wherein the enclosure has acentral opening on its upperside, the second reflector being positionedin said opening, and means to secure said reflector to the adjoiningwall of the enclosure.
 9. A lighting fixture according to claim 1wherein the socket means is mounted on a bracket having radiallyextending flanges, resiliency mounted screw means extended through theflanges and cooperable with a wall of the housing.